Image recording apparatus and power shutoff process method for use therein

1. An image recording apparatus comprising:

at least one recording unit that includes a nozzle array constituted by a plurality of nozzles and a nozzle array drive unit for driving the nozzle array;

a conveyance mechanism for supporting and conveying a recording medium, which is conveyed from an upstream area of a conveyance path and on which a recording process is performed by jetting ink from the plurality of nozzles;

a recovery mechanism comprising a recovery unit for performing a recovery process for recovering from clogging or contamination of the ink in the nozzle array;

a conveyance abnormality detection unit for detecting an abnormality in the supporting and conveying of the recording medium performed by the conveyance mechanism; and

a power control unit for controlling a supply of power to the nozzle array drive unit,

wherein the ink has conductivity, and

wherein when the conveyance abnormality detection unit detects an occurrence of an abnormality in the supporting and conveying of the recording medium that is performed by the conveyance mechanism in the recording process or when the recovery unit makes contact with the nozzle array for the recovery of the nozzle array in the recovery process, the power control unit performs control so as to shut off power supply to the nozzle array drive unit only.

2. The image recording apparatus according to claim 1 , further comprising:

a control unit comprising the power control unit,

wherein the control unit comprises a microprocessor unit and a storage unit storing a control program for making the microprocessor unit function as the power control unit by executing the control program.

3. The image recording apparatus according to claim 1 , further comprising:

a first recording medium detection unit, provided in an upstream area of the conveyance mechanism in the conveyance path, for detecting an edge of the recording medium, and

a second recording medium detection unit, provided in a downstream area of the conveyance mechanism in the conveyance path, for detecting an edge of the recording medium,

wherein the conveyance abnormality detection unit detects an occurrence of an abnormality in the supporting and conveying of the recording medium performed by the conveyance mechanism, based on a detection result obtained by the first recording medium detection unit and a detection result obtained by the second recording medium detection unit.

4. The image recording apparatus according to claim 1 , wherein the recovery unit comprises:

a wiping unit for wiping the nozzle array by sliding the wiping unit on the nozzle array,

a receiving unit for at least receiving the ink jetted from the nozzle array, and

a collection unit for collecting the ink wiped by the wiping unit or received by the receiving unit, and

wherein the recovery mechanism moves the recovery unit to any of the following positions: a retracting position for letting the ink jetted from the nozzles reach the recording medium in the recording process, a position to make the receiving unit come into contact with the nozzle array, and a position to make the wiping unit slide across the nozzle array.

5. The image recording apparatus according to claim 4 , wherein the recovery mechanism further comprises a recovery mechanism moving unit for moving the recovery unit.

6. The image recording apparatus according to claim 4 , wherein the recovery mechanism further comprises a negative pressure generation unit for sucking up ink clogging the nozzle array from the side of the receiving unit.

7. The image recording apparatus according to claim 6 , wherein the recovery mechanism further comprises a waste collection unit to collect the ink sucked up by the negative pressure generation unit.

8. The image recording apparatus according to claim 4 , wherein the recovery mechanism further comprises a pressure unit for ejecting clogging ink from the nozzle array by pressurizing an ink chamber within the nozzle array.

9. A power shutoff method for shutting off power supply to a nozzle array drive unit of an image recording apparatus, wherein the image recording apparatus comprises (i) at least one recording unit that includes a nozzle array constituted by a plurality of nozzles and the nozzle array drive unit for driving the nozzle array, (ii) a conveyance mechanism for supporting and conveying a recording medium, which is conveyed from an upstream area of a conveyance path and on which a recording process is performed by jetting ink from the plurality of nozzles, and (iii) a recovery mechanism comprising a recovery unit for performing a recovery process for recovering from clogging or contamination of the ink in the nozzle array, the method comprising:

detecting an abnormality in the supporting and conveying of the recording medium performed by the conveyance mechanism;

judging whether or not an abnormality in the supporting and conveying of the recording medium that is performed by the conveyance mechanism has been detected in the recording process and whether or not the recovery process is being performed;

shutting off the power supply to only the nozzle array drive unit if it is judged that an abnormality in the supporting and conveying of the recording medium that is performed by the conveying mechanism has been detected; and

judging whether or not the recovery unit is to make contact with the nozzle array during recovery of the nozzle array in the recovery process if it is judged that the recovery process has started, and shutting off the power supply to only the nozzle array drive unit if it is judged that the recovery unit is to make contact with the nozzle array,

wherein the ink has conductivity.